Basement Utility Sink Drain into Auxiliary Vent

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  #1  
Old 01-22-21, 10:35 AM
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Basement Utility Sink Drain into Auxiliary Vent

I want to install a utility sink in my basement. The problem is that the main sewer line is on the other side of the house and there is no way to run a pipe from where I want the sink to the main sewer line easily and without running through a finished portion of the basement. There is however an auxiliary vent pipe right next to where I want the utility sink (see pic). This vent pipe vents fixtures in the second level of my house and directly vents through the roof. Here's my question. Is it okay and to code if I drained the utility sink directly into the auxiliary vent? Is this considered wet venting? Would you expect there to be any problems with this set up? Any insight would be greatly appreciated here.

Thanks!
 
  #2  
Old 01-22-21, 11:06 AM
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What's above this pipe? My guess is that it's a drain to a sink or something upstairs and likely not just a vent.

If it is just a vent, yes, you can use it as a drain without a problem.

If there is a sink/fixture above, you technically can not use it as a drain... but though it's not code compliant, I don't see a huge issue with it. It's technically a wet vent, but in your situation, I think it's better than a separate laundry pump, etc.

Anyway, I would cut off the threaded plug adapter, and extend out from that tee - or replace the whole tee using a no-hub coupler if you need it pointing the other direction. Add a trap adapter and a 1.5" slip trap into your laundry tub and you'll be all set!

 
  #3  
Old 01-22-21, 11:17 AM
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Got it. Thank you for the reply! I've ran every sink/fixture in my house and nothing drains in that line. It definitely goes upstairs and then through the roof so I was guessing this is a vent line only for the upstairs fixtures.

Thanks again!
 
  #4  
Old 01-22-21, 02:07 PM
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That pipe is a drain for something. Vent lines do not extend below the fixtures they protect. Are there rough-in's in your basement for a future bathroom?
 
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Old 01-22-21, 03:01 PM
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Thank you for the reply. There are no rough-in's in my basement for a future bathroom and I can't seem to find anything that drains into that line. Any advice? I would like to be complaint with code if possible but I really want to make sure draining into this line will not cause any problem and it sounds like it won't from the Zorfdt's reply.
 
  #6  
Old 01-24-21, 07:58 AM
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Since there are no fixtures above, it's possible that pipe was included specifically for a future laundry sink.

I can't think of anything else that would be used for - if it were my house, I'd move forward with installing the sink!
 
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  #7  
Old 01-27-21, 06:20 PM
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I installed the sink. No problems. Thanks all for the info!
 
 

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